Right, the outside has a peaceful drawbridge over river decor. There will be guards stationed at the bridge.
Inside there is a spacious entrance room where we can place a line of "Happy to help you", and a lovely receptionist.
Upstairs is there the security measures begin. Incase orcs ever try to invade, small walls that for some reason people can't simply step over have been placed in an irrational pattern in the hope of thwarting the minds of silly orcs! There are two encased areas, that can be blocked off with bagballs, where two archers or mages can start an unholy assault.
Should the orcs get to the next floor, it is a long, fully bag-ball-able floor containing a teleporter at either end. Any remaining orcs by this point will be faced with a maze of wooden boxes and bagballs! Who the hell wouldn't be scared!
Failing all that, the Red Crusader's last ditch effort to fight off an orc invasion is a room that the trickster Kronos the mage calls "Crazy rooms". A crystaline dungeon that - though perception would have it appear so - does not exist on this plane of existance. Once you teleport into this level, there is no going back until one side prevails... It's all or nothing in close quarters. This is a last ditch effort for Red Crusaders.